Synthesis and characterisation of polyoxotungstate compounds with complex copper and cobalt cations

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Gamelas, JAF (Author) Other; Cavaleiro, AMV (Author) Other; Freire, C (Author) FCUP; De Castro, B (Author) FCUP

Journal

Title: Journal of Coordination Chemistry

Vol. 54

Pages: 35-51

ISSN: 0095-8972

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-000-XBE

DOI: 10.1080/00958970108022628

Abstract (EN): Salts of the heteropolytungstates [PW11M(H2O)O-39](5-)(,) M=Cu, Co, Mn, with the following complex cations were prepared: [Cu(LL)(2)(H2O)](2+) , [Cu(LL)(3)](2+) , LL=1,10-phenantroline (phen), 2,2 ' -bipyridine (bipy), [Cu(phen)(2)Cl](+), [CO(bipy)(2)(CO3)](+), and [Co(phen)(3)](2+). Compounds with [SiW11M(H2O)O-39](6-), M = Cu, Co, Mn, and the cations [Cu(LL)(2)(H2O)](2+), and [CO(bipy)(2)(CO3)](+) were also prepared. Synthesis was carried out in aqueous or nitromethane solutions. The compounds were characterised by elemental and thermal analysis and spectroscopic techniques. Spectroscopic properties and the thermal stability of the polyanions; in these compounds could thus be compared with those of simpler Salts. BET surface areas were determined. Except for salts of [Cu(bipy)(3)](2+), the compounds decompose on heating at temperature above 200 degreesC, the exact temperature depending on the cation. Some are stable up to 300 degreesC. For salts of the [Cu(LL)(2)(H O-2)](2+) cations, more detailed thermal studies were performed, based on the infra red spectra of the decomposition products obtained at several temperatures.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17